Joint member

Abstract

To provide a joint member that can be fitted even in the state that a reinforcement bar on one side has a nut screwed on.SOLUTION: A joint member 1 comprises a first integration recess part 11, a second integration recess part 12, a connection part 13, and a retrofitting contact plate 14. The first integration recess part comprises: a space part 111 into which the end part of a reinforcement bar 81 on one side and a nut 83 screwed on a tip male-screw part 81a of the reinforcement bar 81 fit; and an opposed wall part 112, which has an opposed surface 112a having a nut 83 facing to it and a first insertion hole 112b through which the tip male-screw part 81a is inserted. The second integration recess part comprises: a space part 121 into which the end part of the reinforcement bar 81 on the other side and a nut 83 screwed on a tip male-screw part 81a of the reinforcement bar 81 fit; and an opposed wall part 122, which has a nut-side surface 122a having a nut 83 facing to it and a second insertion hole 122b through which the nut 83 can be inserted. The connection part connects the opposed wall parts 112 and 122. The retrofitting contact plate prevents the nut 83 in the second integration part 12 from getting back into the second insertion hole 122b by hitting the nut 83.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a joining member that can be used to join precast concrete members. [Background technology]

[0002] Patent Document 1 discloses a joint structure in which the end of a reinforcing bar with a threaded end is passed through a connecting metal fitting, and the connecting metal fitting is clamped and fixed from the front and back with a nut that screws onto the end of the reinforcing bar, and the reinforcing bars are connected to each other in the same direction via the connecting metal fitting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 5-94429 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the joint structure disclosed in Patent Document 1, after two reinforcing bars are inserted into the through holes of the joining metal, nuts must be screwed onto the ends of each reinforcing bar, which does not improve work efficiency.

[0005] In view of the above circumstances, an object of the present invention is to provide a connecting member that can be attached even when a nut is already screwed onto one of the reinforcing bars. [Means for solving the problem]

[0006] In order to solve the above problems, the joint member of the present invention is a joint member for joining protruding reinforcing bars of precast concrete members arranged with their end faces facing each other, A first fitting recess having a space into which an end of one of the reinforcing bars and a nut screwed onto the male threaded end of the reinforcing bar are fitted, and an opposing wall having an opposing surface facing the nut and a first insertion hole through which the end of the reinforcing bar is inserted; A second fitting recess having a space into which the end of the other reinforcing bar and a nut screwed onto the tip male screw of the reinforcing bar are fitted, and a nut side surface on which the nut is located and an opposing wall portion having a second insertion hole through which the nut can be inserted; a connecting portion that connects the opposing wall portion of the first fitting recess and the opposing wall portion of the second fitting recess; and a contact means for preventing the nut in the second fitting recess from returning into the second insertion hole by contacting the nut.

[0007] With the joining member having the above configuration, the end of one of the reinforcing bars can be inserted into the first insertion hole, and the nut can be screwed onto the male threaded end of the reinforcing bar in the space of the first fitting recess. The nut can then be screwed onto the other reinforcing bar, and the joining member can be moved to the other reinforcing bar side, and the nut can be passed through the second insertion hole, so that both nuts can be positioned within both spaces of the joining member. This state is maintained by the abutment means preventing the nut in the second fitting recess from returning into the second insertion hole.

[0008] The connecting portion has an opening on the upper side, and the contact means is composed of a post-attaching contact plate having a notch, and this post-attaching contact plate may be inserted between the nut side surface and the nut through the opening and fitted into the end of the reinforcing bar with the nut inserted through the second insertion hole. This makes it possible to easily prevent the above-mentioned blocking by post-attaching the post-attaching contact plate while avoiding the structure of the joint member from becoming complicated. In addition, such a joint can be easily performed while visually checking through the opening.

[0009] A guide groove for guiding the insertion of the retrofit contact plate may be provided, whereby the retrofit contact plate can be easily attached at an appropriate position.

[0010] The contact means may be an adjacent hole portion formed in communication with the second insertion hole, having an inner diameter smaller than the second insertion hole and through which an end of the reinforcing bar passes, having a center coincident with that of the first insertion hole, and communicating with the second insertion hole. With this, the connecting member can be positioned between both reinforcing bars by moving the connecting member toward the other reinforcing bar in a tilted state and passing the nut through the second insertion hole, and then the tilt of the connecting member is eliminated to match the center of the adjacent hole portion with the center of the first insertion hole, and the other reinforcing bar is introduced into the adjacent hole portion, thereby preventing the nut in the space portion of the second fitting recess from returning to the second insertion hole. Effect of the Invention

[0011] With the present invention, even when a nut is screwed onto one of the reinforcing bars, the joining member can be positioned between the two reinforcing bars, thereby improving the efficiency of the work of joining protruding reinforcing bars of precast concrete members. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic explanatory diagram showing the joints between protruding rebars of a precast concrete foundation arranged with their end faces facing each other. [Diagram 2] 1A to 1C are a schematic plan view, a left side view, a right side view, and a perspective view showing a joining member of an embodiment. [Diagram 3] 10 is an explanatory diagram showing a procedure for attaching a joint member of an embodiment to a nut screwing point of a reinforcing bar at a joint of a precast concrete foundation. FIG. [Figure 4] 1 is an explanatory diagram in the form of an oblique view showing a procedure for attaching a joint member of an embodiment to a nut screwing point of a reinforcing bar at a joint of a precast concrete foundation. FIG. [Diagram 5] 1A to 1C are a schematic plan view, a left side view, a right side view, and a perspective view showing a joint member that is a modified example of an embodiment. [Figure 6]10 is an explanatory diagram showing a procedure for attaching the joint member of the above modified example to a nut screwing point of a reinforcing bar at a joint of a precast concrete foundation. FIG. [Figure 7] 13 is an explanatory diagram in the form of an oblique view showing a procedure for attaching the joint member of the above-mentioned modified example to a nut screwing point of a reinforcing bar at a joint of a precast concrete foundation. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 shows a state in which one reinforcing bar 81 and another reinforcing bar 81 are positioned with their tips butted against each other. Each reinforcing bar 81 protrudes into a grout-filled recess 82 formed on the upper surface side of the end face of the precast concrete foundation 80. The precast concrete foundation 80 is suspended, for example, by a crane and placed on a footing portion (not shown).

[0014] Each reinforcing bar 81 is, for example, an anchor bar lap-spliced ​​to the upper end bar of each precast concrete foundation 80, and has a tip male screw portion 81a at its tip. A hexagonal nut 83 is screwed into each tip male screw portion 81a. In this example, a nut 83 with a washer is screwed into one reinforcing bar 81, and a nut 83 without a washer is screwed into the other reinforcing bar 81.

[0015] 2 shows a joint member 1 that joins reinforcing bars 81 of a precast concrete foundation 80. This joint member 1 has a first fitting recess 11, a second fitting recess 12, a connecting portion 13, and a post-attached contact plate (contact means) 14.

[0016] The first fitting recess 11 includes a space 111 for accommodating an end of one reinforcing bar 81 and a nut 83 screwed onto a leading male thread 81a of the reinforcing bar 81, and an opposing wall 112 having an opposing surface 112a facing the nut 83 and a first insertion hole 112b through which the end of one reinforcing bar 81 is inserted. The opposing wall 112 is made of a rectangular steel plate.

[0017] The second fitting recess 12 includes a space 121 for accommodating the end of the other reinforcing bar 81 and a nut 83 screwed onto the leading male thread 81a of the reinforcing bar 81, and an opposing wall 122 having a nut-side surface 122a on the side where the nut 83 is located and a second insertion hole 122b through which the nut 83 is inserted. The opposing wall 122 is made of a rectangular steel plate.

[0018] The connecting portion 13 is a member that connects the opposing wall portion 112 of the first fitting recess 11 and the opposing wall portion 122 of the second fitting recess 12. The connecting portion 13 is made of, for example, two rectangular steel plates 131, 131 that connect the edge sides of the opposing surface 112a and the nut-side surface 122a to each other, and openings 13a are formed on both the upper and lower surfaces of the joining member 1.

[0019] The connecting portion 13 has a guide groove 132 that guides the insertion of the retrofit contact plate 14. This guide groove 132 is formed in contact with a surface 122a of the second fitting recess 12 on the nut side.

[0020] The rear-attaching contact plate 14 has a notch 14a into which the end of the other reinforcing bar 81 is introduced. The rear-attaching contact plate 14 is made of a rectangular steel plate, and a semicircular hole at the end of the notch 14a is located in the approximate center of the rectangular plate. This semicircular hole is the portion into which the other reinforcing bar 81 fits. The width of the notch 14a is set so that the nut 83 does not pass through.

[0021] With the nut 83 inserted into the second insertion hole 122b and positioned within the space 121, the rear-mounted stop plate 14 is inserted into the guide groove 132 between the nut-side surface 122a and the nut 83, and fitted into the end of the other reinforcing bar 81. In this fitted state, the rear-mounted stop plate 14 abuts against the nut 83 in the second fitting recess 12, thereby preventing the nut 83 from returning into the second insertion hole 122b.

[0022] Next, the procedure for attaching the connecting member 1 will be described with reference to Figures 3 and 4. For example, a worker attaches the connecting member 1 to one reinforcing bar 81 using the first insertion hole 112b before aligning the installation of the precast concrete foundation 80, and screws a nut 83 into the tip male thread portion 81a of the one reinforcing bar 81. Then, the precast concrete foundation 80 with the connecting member 1 temporarily fastened to the one reinforcing bar 81 in this way is placed on the end face side of the precast concrete foundation 80 having the other reinforcing bar 81.

[0023] Next, the joint member 1 is shifted, and the nut 83 screwed onto the other reinforcing bar 81 is introduced through the second insertion hole 122 b , and this nut 83 is positioned in the space 121 of the second fitting recess 12 .

[0024] Next, the retrofitting support plate 14 is fitted onto the end of the other reinforcing bar 81 from the upper opening 13a along the guide groove 132, and the nut 83 is tightened.

[0025] In the joint member 1 having the above configuration, an end of one reinforcing bar 81 can be inserted into the first insertion hole 112b, and a nut 83 can be screwed onto the male threaded end 81a of the reinforcing bar 81 in the space 111 of the first fitting recess 11. The nut 83 can be screwed onto the other reinforcing bar 81, and the joint member 1 can be moved to the side of the other reinforcing bar 81, and the nut 83 can be passed through the second insertion hole 122b, so that both nuts 83, 83 can be positioned within both spaces 111, 121 of the joint member 1. This state is maintained by inserting the rear stop plate 14 to prevent the nut 83 in the space 121 of the second fitting recess 12 from returning into the second insertion hole 122b.

[0026] Furthermore, when the rear-mounted contact plate 14 is used as the contact means, the return can be easily prevented by later mounting the rear-mounted contact plate 14 while avoiding the complication of the structure of the joining member 1. Note that the surface of the rear-mounted contact plate 14 may have a color and reflectance different from those of the parts of the joining member 1 other than the rear-mounted contact plate 14 so that forgetting to insert the rear-mounted contact plate 14 can be easily detected.

[0027] If the joining member 1 has the guide groove 132, the retrofitting contact plate 14 can be easily attached at an appropriate position. Such a guide groove can also be formed in the opposing wall portion 122 of the second fitting recess 12. Also, a structure without such a guide groove can be used.

[0028] Next, a modified example of the joint member 1 will be described with reference to Fig. 5, Fig. 6, and Fig. 7. In this example, a nut 83 with a washer is screwed onto both the one reinforcing bar 81 and the other reinforcing bar 81. The joint member 1 according to this modified example has an adjacent hole portion 122c as abutment means.

[0029] The adjacent hole portion 122c is formed in the facing wall portion 122 of the second fitting recess 12, has an inner diameter smaller than that of the second insertion hole 122b through which the end of the reinforcing bar 81 passes, and communicates with the second insertion hole 122b. A line passing through the center of the adjacent hole portion 122c coincides with a line passing through the center of the first insertion hole 112b of the first fitting recess 11, and the center of the second insertion hole 122b is shifted toward the lower opening 13a side with respect to the first insertion hole 112b of the first fitting recess 11. On the other hand, the second insertion hole 122b is formed shifted downward of the facing wall portion 122 so that its center is lower than the center of the first insertion hole 112b of the first fitting recess 11.

[0030] With this configuration, when the joint member 1 is moved to the other reinforcing bar 81 side, the second fitting recess 12 side is lifted and the joint member 1 is tilted in accordance with the above-mentioned deviation of the second insertion hole 122b, and the nut 83 is passed through the second insertion hole 122b, and after the nut 83 passes through the second insertion hole 122b, the second fitting recess 12 side is lowered to eliminate the above-mentioned tilt, the center of the adjacent hole portion 122c is aligned with the center of the first insertion hole 112b, the other reinforcing bar 81 is introduced into the adjacent hole portion 122c, and the nut 83 is tightened. This prevents the nut 83 in the second fitting recess 12 from returning to the second insertion hole 122b.

[0031] In the above example, the joint member 1 is applied to the upper part of the precast concrete foundation 80, but the present invention is not limited to this, and the joint member 1 can also be applied to a part on the lower side of the precast concrete foundation 80 where one reinforcing bar 81 and the other reinforcing bar 81 are positioned with their tips butted against each other. Also, by providing the upper opening 13a, the joint on the lower side of the precast concrete foundation 80 can be easily performed while visually inspecting.

[0032] In addition, the above-mentioned joint member 1 has openings 13a on both the top and bottom, but the lower opening 13a may be closed with a steel plate. This steel plate should preferably have holes for venting air when filling with grout.

[0033] In the above example, the opposing walls 112, 122 are made of a rectangular plate material, but the present invention is not limited to this and may be made of a circular plate material or the like.

[0034] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0035] 1: Joint material 11: First fitting recess 12: Second fitting recess 13: Joint 13a: Opening 14: Rear mounting plate 14a: Notch 80: Precast concrete foundation 81: Reinforced concrete 81a: Male threaded tip 82: Grout-filled recess 83: Nut 111: Spatial part 112: opposing wall 112a: Opposite surface 112b: First insertion hole 121: Spatial part 122: Opposing wall 122a: Nut side surface 122b: Second insertion hole 122c: adjacent hole 131: Rectangular plate material 132: Guide groove

Claims

1. A joint member for joining protruding rebars of precast concrete members arranged with their end faces facing each other, a first fitting recess having a space into which an end of one of the reinforcing bars and a nut screwed onto the male threaded end of the reinforcing bar are fitted, and an opposing wall having an opposing surface facing the nut and a first insertion hole through which the end of the reinforcing bar is inserted; a second fitting recess having a space into which a nut screwed onto the end of the other reinforcing bar and the male threaded tip of the reinforcing bar fits, and a nut-side surface on which the nut is located and an opposing wall having a second insertion hole through which the nut can be inserted; a connecting portion connecting the opposing wall portion of the first fitting recess and the opposing wall portion of the second fitting recess; abutment means for preventing the nut in the second fitting recess from returning into the second insertion hole by abutting the nut.

2. 2. The connecting member according to claim 1, wherein the connecting portion has an opening on the upper side, and the contact means comprises a rear-attached contact plate having a notch, and this rear-attached contact plate is inserted through the opening between the nut side surface and the nut with the nut inserted into the second insertion hole, and fitted into the end of the reinforcing bar.

3. 3. The joining member according to claim 2, further comprising a guide groove for guiding the insertion of said post-installation contact plate.

4. 2. The connecting member according to claim 1, wherein the contact means is an adjacent hole portion having a smaller diameter than the second insertion hole and an inner diameter through which the end of the reinforcing bar passes, having a center coincident with that of the first insertion hole, and being formed in communication with the second insertion hole.

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